Answer: Option D
Dispute : a disagreement or argument.
Challenge : a call to someone to participate in a competitive situation or fight to decide who is superior in terms of ability or strength.
Advice : guidance or recommendations offered with regard to prudent future action.
Warning : a statement or event that warns of something or that serves as a cautionary example.
Caveat : a warning or proviso of specific stipulations, conditions, or limitations.
Synonym of Caveat is Warning